pippo

regarding man from monkeys, I heard that at least one disadvantage from apes evolving to upright bipedals was that man gets way more backaches that apes/monkeys. Lower back aches/pain (the kind Im feeling right now) is a cost of walking upright, even though many advantages of bipedalism are clear. Is this true, people? Thanks

John, although the OP is gone by now, for the record, one shouldnt perform any chem work tacidly......lol. I hope you dont either. I felt he was not clear as to what he even wanted. That was the reason for my detailed units explanation/clarification. That is my kind of chemistry, and if I had to approach doing this also for a living tacidly, I would only be helping my competition, right?

The OP did not indicate if he meant 10% v/v or 10% w/w, or even w/v, or a Normality (molarity) value. There is a huge difference. It can not be said how to do this dilution unless he specifies the units. Assuming otherwise shows lack of laboratory and manufacturing, and assaying experience. just the same, he is long gone from a July posting.....on to another thread.

"you dont want even a drop on your gloves"?? Why? Thats what gloves are for. I suggest you change glove brands/type, or you are taking some risk there. Thats the whole purpose of gloves. Also, suggesting HDPE is not suitable for sulfuric is baseless. It is known industry wide that 1.9 sg UN bottles are more than adequate for sulfuric. 4 months?? I have had HDPE bottles with conc H2SO4 for over 12 years. darkened yes. "weakened", I can not say as I have not tested them, but I you can not have a UN rating on 1.9 sg bottles if that were the case. and as for VWR- yes, if you want to pay "store front" prices. Do not ever pay catalog price from VWR. Ask for a 40% discount or tell them you will shop elsewhere.

This is a challenge. Just had a thought- maybe in the Handbook of Physics and Engineering? Time to find this in there.........I will report back if I have any luck.

LOL....budy of mine tried it- making a power generator from neodynium magnets. I told him Physics 102 (not 101). It ended up in the corner of his garage...LOL

How can you have 2 hydrocarbons, one propane, other is isobutane, both have a autoignition temp of < 1000 deg F, and when combined, the AI temp becomes higher- about 1600 deg F? There has to be an additive, right? Any way to predict AI temps? Any physical chemists/engineers here? Thanks!

Right, but diluting it to your desired 10% HCl does not indicate the molarity- only way to find it is to consult tables. 10% w/w HCl is 100g HCl per 1000grams, not 1000mls. You cant know the molarity unless you know how many mls the 1000g of the 10% will be. tables is it.

First, I doubt you actually have 98% w/w sulfuric- typicallly, reagent grade is closer to 95-96. Still, dangerous stuff. Second, sulfuric is NOT corrosive to plastic HDPE. Only thing over time (2-3 years), it will discolor the natural poly appearence, but never corrode/weaken the bottle. But, do not store it in an un approved poly, but only UN rated sg 1.9 DOT bottle. Glass is excellent. But, heavier, on top of having to deal with the 1.86 +/- sg of the sulfuric.

Although I make /sell the icp standards, we dont have one in house- we farm that out. BUT, did you buy from a manufacturer or 2nd hand? Should come with operators manual. Also, you should be able to request the books from whomever made it- shouldnt be a problem. Good luck. (They are expensive to maintain)

When they say "sodium citrate dihydrate" 173g, they mean plain and simply, 173g of the dihydrate salt. The 2 H2O's are already figured into the weight. Comercially available sod citrate di is the norm. I have not yet encountered anything different.

Right- the salts will just be in solution with no change. You can also use pure Mg metal (chips/granules, etc) and add HCl SLOWLY, stoichiometrically. Sorry, youll have to do the math.......

Iggy, That abstract was great. Very easy to read/understand, although, true, this is not that intense a subject. Looks like 1-3 hrs should do it for the effect to entirely clear. Now, it may be that acetaldehyde is a carcinogen, but hey, for that matter, so isnt ethyl alcohol! Thing to know though, is its not enough to know a compound is a carcin or not, you have to understand the environment- eg: concentration of that carcin compound, etc. Another words, its like saying phenol is a poison (and, depending, its a deadly poison/carcinogen), but we rub it on our faces every day (Blistex, etc). Even spray it down our throats (Cloraseptic). Still, I appreciate the idea/point presented. The point: I can still drink a 12 oz beer at dinner (6 pm) without worrying that it will induce me to get up at 2-3AM....LOL Thanks, people Ewmon, thanks for your info and personal feedback. Only thing, I should debate your "same effect", in a friendly way- I dont believe that soda/sugary pop/soft drinks/whatever causes the liver to detoxify as it has to with ethyl alcohol. Sugar is not a toxin- just shocks the pancreas with spike sugar. No?

People, We know alcohol consumption need to be detoxified by the liver through an enzyme in the liver. I think, the liver requires extra water for that purpose, and as a result, robs it from other body tissues to get it done, resulting in waste "water (the diuretic effect). If this is not entirely accurate, pls correct me. So, how long does this process take from the time of consumption to when the effect of the diuretic process finishes? In other terms, when will one stop urinating profusely cuz he got drunk? What if he only drank a 12 oz size (not drunk)? Tanks!

Good points psych. Now, I have to give deeper thought than I first expected. Since posting this, I learned (maybe it applied here) olives are either hermaphrodite or non. Too much mystery for me to unravel in a day or 2. In southern mediterranean, it is common acceptance that olives produce every other year, and not understood well why (ag engineers probably DO understand). Man, I have to iron this out before I spend years nurturing my trees, then planting them, only to learn I planted them in the wrong place/wrong genetics. Best bet otherwise is to mix up types, and make sure I dont place incompatable trees, as there are types that will never cross, period, believe it or not.

Hi people, I figured Id try posting here before perhaps another site- Olives traditionally need another tree to cross pollenate or you will get no fruit. (recently, self pollenating trees have been "bred", though). My only question is: If one clones another tree from say, the mother tree, then wait a few years for growth, would those then 2 trees cross pollenate effectively or does it HAVE to be another individual tree (with different genetics, of course) to pollenate? (I clone olive trees from snipping the tips of twigs. difficult, but I figured out the trick. Now, only need to know if all these clones are useless with each other. If so, no big problem- I'll just clone a bunch from another parent then intermix all of the trees) Thanks!

so far, I found that desirable properties of a good refrigerant are low bp, high critical temp, high heat of vaporization, and others. Thing is, If one had to choose the single biggest factor among the 2 or 3 properties above, would you choose low bp over high critical point? Opinions appreciated.

Well, Im a little late, but you may be curious on some compounds that I have worked with as being hygroscopic: Of course, CaCl2 has been mentioned. cheap and safe Concentrated sulfuric acid- quite dangerous/not available to consumer market Magnesium chloride 6XH2O- expensive, safe Lithium compounds- chloride/bromide, hard to get Mercuric chloride/nitrate- expensive, TOXIC just a few......

People, Wondering if the term thermal expansion coificcient is correct for evaluating the effectiveness/efficiency of different chemical compounds that are used in ac applications. Is this term correct? For example, such a table would make clear that R12s more effieient (colder) that R134a, ceritus paribus.. I am searching for a table that compared different - mostly organic compounds (yes, including R12, R134a. propane, butane, etc ) For that matter, even inorganics like ammonia, CO2, etc etc etc. Thanks!

Well, cant reproduce everything 100%, you know- Ive been taking care of it the same way, basically. Thats all I can say. No more tomatoes on it now. I think its almost dead.....have seeds though. Time to start a new, eh?

I may have picked the last of the cherry tomatoes from this plant today. On its last leg.....

All methods Ive read say this...its a pain. Wondering if this is a method that has past its day, that maybe new hematoxylin harris can be made just as effective without the boiling/then "plunging into ice cube water". Thanks, people.

Right, string, my tomato IS getting weaker, even though I "cloned" it. I will see just how far I can push it though. Its still making tomatoes biut no where near as vigorous as the first plant.... OK, fair enough. Guess Im propagating it by the clone technique?? It for sure not a graft (another method of propagation).......

People, Wondering what your advice would be on this- say you have a tomato plant, and snip off a tip of it (5-6"), and add rooting hormone, plant carefully, and wait until it grows/takes on roots pretty well. Of course, it should produce the same tomatoes, one would assume. But say you repeat this again, say, when the new plant reaches a good height of about 2-3', and starts to wither again, at which time you snip off , again, another 5-6" of plant tip to start growth again. Of course, you again, would expect tomato fruit. Can this continue forever? I heard this can lead to genetic bottlenecking (which I think means concentration of defective genes.........) I cant understand if so, why would it lead to bottlenecking, when the plant did not "breed" with another.....LOL Seriously, maybe it has to do with the flowering of the fruit- and bees?? Thanks

Fine, jeorge. Trivial matter and a waste of time. Sad thing is- you are right. This is a waste of time discussing exfoliants as well as the other issues here. I said above "skin care products that are made in the tens of thousands of gallons", not that the exfoliant polymer ingredient itself is produced then bottled as a 100% pure material in the tens of thousands of gallons. There is a difference. I take it you are not in the manufacturing/formulations sector/industry. No problem, jeorge. Yes, again, you are right- the dilution factor is great. Sure- what the heck, all this junk will eventually get diluted, so theres nothing to be concerned about. "Its a total waste of time as we address other issues". What issues, jeorge? What issues are so important that are discussed here?? And then , what happens to these so called important issues? The fact that you and me blow our time sitting down looking at a monitor cuz we have 15 minutes to waste- that is the waste of time. Like these other "important issues" will be noticed by the real powers that be out there. I know you and me mean well, but face it- NOTHING is going to happen to fix the whole mess. If you believe otherwise, You have to start getting away from pure science, which lives in a vacuum. The same is probably said of all the other multitudes of junk floating in the Gyre-Pacific Garbage Patch. Oh, its only a few bags, whatever. It will be in such a huge ocean..........again the dilution factor You really need to read about Thompson, and the sources of the stuff found in the patch. Heck, Thompson is not the only one who did work on that "patch". Everybody knows about it. I just blew 10-12 minutes typing that post. Going to bed to read a book on Cosmetics Formulations. Maybe catch an episode rerun of Survivorman........